So, your takeaway from all the posts in this thread is that no one knows how analog QCII paging works? Instead of realizing that we were asking you which agency's paging system you were specifically referring to, you give us an explanation of how it works? Amazing.
Anyway, I'll play along. Most digital paging talkgroups still carry the tones along with the voice, so your assertion that you'd only hear the voice dispatch by monitoring such a paging TG is going to be false in most cases. Whether you listen to the "antiquated" analog paging frequency, or monitor the digital paging talkgroup, you're probably still going to hear those gosh darn annoying tones.
I would suggest that you do some reading up on how digital tone signaling, aka QCII over P25, actually works. APX subscribers setup to alert require the tones, as do Unication G Series pagers if they're setup for QCII instead of the horribly inefficient dedicated talkgroup method.
Oh and analog paging isn't going anywhere in most cases, because it's very reliable and it would cost a fortune to replace relatively cheap analog pagers with digital capable units. If it ain't broken...